diff options
Diffstat (limited to 'libsolidity')
| -rw-r--r-- | libsolidity/SolidityOptimizer.cpp | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/libsolidity/SolidityOptimizer.cpp b/libsolidity/SolidityOptimizer.cpp index 4986b146..e50469dd 100644 --- a/libsolidity/SolidityOptimizer.cpp +++ b/libsolidity/SolidityOptimizer.cpp @@ -272,6 +272,42 @@ BOOST_AUTO_TEST_CASE(storage_write_in_loops) compareVersions("f(uint256)", 36); } +BOOST_AUTO_TEST_CASE(retain_information_in_branches) +{ + // This tests that the optimizer knows that we already have "z == sha3(y)" inside both branches. + char const* sourceCode = R"( + contract c { + bytes32 d; + uint a; + function f(uint x, bytes32 y) returns (uint r_a, bytes32 r_d) { + bytes32 z = sha3(y); + if (x > 8) { + z = sha3(y); + a = x; + } else { + z = sha3(y); + a = x; + } + r_a = a; + r_d = d; + } + } + )"; + compileBothVersions(sourceCode); + compareVersions("f(uint256,bytes32)", 0, "abc"); + compareVersions("f(uint256,bytes32)", 8, "def"); + compareVersions("f(uint256,bytes32)", 10, "ghi"); + + m_optimize = true; + bytes optimizedBytecode = compileAndRun(sourceCode, 0, "c"); + size_t numSHA3s = 0; + eth::eachInstruction(optimizedBytecode, [&](Instruction _instr, u256 const&) { + if (_instr == eth::Instruction::SHA3) + numSHA3s++; + }); + BOOST_CHECK_EQUAL(1, numSHA3s); +} + BOOST_AUTO_TEST_CASE(cse_intermediate_swap) { eth::KnownState state; |